Nu-Way MGN 2800N Installation & Maintenance Manual

Nu-Way MGN 2800N Installation & Maintenance Manual Manual pdf 15 page image

MGN 2800N HP 14AIR DAMPER MOTOR - MODULATINGCONTROL BOX SEQUENCE & TIMING CHARTBAStart Run OffReadyForRestartBurner MotorIgnitionStart RateGas ValveMain Gas Valve(low flame on h/l)High Flame(h/l only)OperationT1 T2T8T3T4T5 T6T7T9T totalLandis & Staefa SQM10Motor SQM 10Air DamperPosition Cam FactorySettingFull AirShut-off 2 0°Low FlameAir 3 20°High FlameAir 1 60°The fully closed cam (2) is factory set and under normal circumstances should not require further adjustment.Operation of the low and high flame air switches (cam 3 & 1) is made by manually adjustable cams. Settingscales provided between the cams simplifies the adjustment. An additional scale at the end of the cam stackserves as a position indicator.The air damper assembly can be rotated manually by disconnecting from the drive motor using the lever ‘A’.The cams should be adjusted by using the special C spanner ‘B’.TimingSegment TMG 740-3 LFL1.3 Operating Mode TimingSegment TMG 740-3 LFL1.3 Operating ModeT1 40 40 Pre-purge T6 6 12 Delay – Release to HighFlame / ModulationT2 4 6 Pre-ignition T7 10 18 Post-purgeT3 3 3 Safety Lockout Time T8 8 12 Air Proving Switch InterlockT4 Delay – Start Rate to Main Flame T9 80 91 Total Start TimeT5 9 12 Delay – Start Rate to Main flame T Total 90 106 Total Cycle Time of ControllerNote:The pre-purge tomes shown above refers to the control box only. The air damper control will extend the total burnerpurge time up to a maximum of 127 seconds depending on the firing rate and air requirements of the appliance.